GSP not opening

[Xtasia]

These corals will often react to changes in water parameters by ceasing to open or not opening at all.
Might be chemical warfare..
Might just need to be closed for a little bit...
Might be light.
Might be upset over being move.

How long have they been closed?

From Wetwebmedia:
<many causes for extended polyp retraction on Star Polyp. Common causes,
lack of string random turbulent flow or too much linear flow, diatom algae
or like nuisance coating the stolon mat (scrub off with a toothbrush and
don't be shy about it), sudden change in light or salinity (bulb change,
carbon change after long period without which cause sudden increase in
water clarity in tank <yellow to clear water>, some say excess iodine
supplements, perching fishes (new Hawkfish to the tank or like species
without swim bladder, OK... now I'm stretching <VBG>. Water flow and
Lighting changes really are most common. Best regards, Anthony>